Re: [Elecraft] K2 filter optimisation

2021-04-19 Thread Bill Coleman 



> On Feb 12, 2021, at 3:59 AM, Ian Maude  wrote:
> 
> When I originally aligned this (back in 2004) I was able to use Spectrogram
> to align the filters well.  Is there a modern replacement for this,
> preferably for Mac?

I use CocoaModem, which has a pretty good spectral display, perfectly adequate 
for adjusting the filters on the K2.

Bill Coleman, AA4LR, PP-ASELMail: aa...@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
   -- Wilbur Wright, 1901

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[Elecraft] Miniature version of AX1 whip

2021-04-19 Thread Wayne Burdick 
I'm always trying to further shrink my KX2 station, especially for hand-held 
operation. 

Recently I've been playing with a miniature base loading coil for the the AX1 
whip. It's very rugged, but also really small:

   Length = 2.0" (1/3rd of the AX1)
   Weight = 0.7 oz   (1/3rd of the AX1)

It takes up almost no room in a go-bag, making it a great backup for other 
antennas. Wind load is also greatly reduced -- that will help when using the 
AXB1 bipod.

Compared to the AX1 it will have a somewhat reduced max power rating (probably 
10 W), and it only covers one band. On the other hand, it could be built for 
any band from 20 to 6 meters, and disassembles into two pieces like the AX1. 

I consider it experimental at this point, and I'd love to get some feedback on 
the concept. We'll have some prototypes to send out sometime in the near future 
to a few volunteer testers.

Please contact me directly if you're interested.

73,
Wayne 
N6KR

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Re: [Elecraft] KBPF3A switching frequencies and performance

2021-04-19 Thread ab2tc 
Hi Russ,

Your response made *very* curious so I checked out my own K3S. I can confirm
the two switchover frequencies you mention (1700 and 3300kHz), but observe
at most a couple of dB change when crossing the boundaries. I use an
external panadapter (LP-PAN/NaP3 connected to IF-OUT) so I can easily see
the same stations and noise while tuning across the boundaries. On the
1700kHz boundary the signals are a couple, maybe 3dB stronger when below
1700kHz. So it sounds to me that the filters in your KBPF3A are not being
switched in when it is supposed to be used. The KBPF3 needs to be enabled
(set to "nor") in the configuration menu. Have you checked that?

Hmm, I neglected to carefully read the last part of your post. It sounds
like your KBPF3A might be working above 4210kHz so may be just the 2 lowest
bands are defective. If you look at the schematic you see that those two
bands use the same filter but with some components switched in and out by
another relay (K2). So that could narrow the problem down to one relay (K1)
not operating. Is this a *new* problem or has it been like this since you
got the K3 or installed the KBPF3A?

Knut - AB2TC


Elecraft mailing list wrote
> Hi Ben:
> You had me curious with your request.  I started to check my KBPF3
> (modified to the "A") and noticed something that now bothers me.  I tried
> going down from 160M and it appears that the switch over to the AM
> broadcast band occurs precisely at 1700,000  Kc.  When I tune to  1.69
> the relays click.  But the anomaly(?) I am seeing at the switchover point
> is a big drop in the signal level.  At my QTH during the daytime the
> nominal noise level at 1700.000 Kc is about S7.  When I switch to 1.69
> the noise level drops to S2.  At the high end the switchover occurs at
> 2109.999+ with a drop in the noise level from S9+10 to S3.  I don't use
> the K3 for listening to AMBCB but only in the case of checking my 160M 
> receiving loops with some stations high in the AM Band.  I checked on 80M
> and got similar results.  At the low side the switch occurred at 3299.999
> with a drop in the noise level from S5 to S2.  On the high side the
> switchover occurred at 4209.999+ but here the noise level increased from
> S4 to S6. I don't know if this helps you any on at least these 2 bands. 
> If I get the time I'll try to check the rest.  Now I'm bothered by the
> changes in signal levels at the switchover points (ignorance is bliss). 
>  I wonder if anyone else has ever noticed this or do I have an issue with
> my KBPF3?
> 
> Russ, N3CO
> On Friday, April 16, 2021, 12:39:28 PM EDT, w4sc 

> w4sc@

>  wrote:  
>  
>  Looking for details of switch over frequencies and expected performance
> of the KBPF3A in its various bands, 
> 
> There is improvement in the BCB and below 500KHz with the KBPF3A enabled,
> however the other SW BCB bands I have tried are lacking.
> 
> Has anyone measured the performance of the KBPF3A?
> 
> Ben W4SC
> 
> Sent from Mail for Windows 10
> 
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> lists+1215531472858-365791@.nabble





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[Elecraft] KPA500 Question

2021-04-19 Thread Bob McGraw 


I'd say the switching FETs have failed.    Correctly operating, there is 
no measurable attenuation in the receive line when in OPER or STBY modes.


As to T/R switching, make sure the amp is  in receive and not in 
transmit when your radio is in receive.   Any of the items in the amp 
display preceded with a * indicates the amp is in transmit mode.   If 
so, something is pulling the KEY line to ground.


73

Bob, K4TAX



Message: 1
Date: Sun, 18 Apr 2021 17:36:48 -0400
From:
To:
Subject: [Elecraft] KPA500 Question
Message-ID:<001001d7349a$f0a01570$d1e04050$@gmail.com>
Content-Type: text/plain;   charset="us-ascii"

I just purchased a used KPA500 (SN 0456) from a close friend. The amp was
just back to the factory for several repairs and was thoroughly tested. The
report reads, "KPA500 #0456 meets or exceeds all factory specifications." My
friend unboxed the amp and made several QSOs to be sure all issues were
fixed. He then personally delivered the amp to my QTH.
Over the weekend I got the amp added to my operating position and was quite
surprised to find that input signals are attenuated significantly when the
amp is switched from STBY to OPER. No, this is NOT the issue with having the
aux cable and the PA key line connected at the same time. This is with NO PA
key, and NO aux cable connected. The amp has no connection but RF input and
output. It is independent of band. This is with a matched antenna, band
switched manually with the front panel buttons. When I engage OPER the input
signal is attenuated by ~20 dB.
On the TX side, the amp is fine. On most bands I get full rated output into
a dummy load with approx. 20 Watts of drive from the K3.
I noticed on the service report, one of the tests was, "Tested receive
attenuation and IMD." I'm curious about "receive attenuation." This would
seem to be related to my problem. Looking at the block diagram, I surmise
something in the TR switch is malfunctioning.
Before I bug an already-overloaded Elecraft support, I am open to
suggestions. Am I missing something obvious?
TIA es 73,
Jim - WS6X
P.S. Yes, I have read the manual, and scoured the archives. The only thing I
can find regarding input attenuation in the OPER mode involves incorrect
cabling.


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[Elecraft] WTB: KXPA100 preferably with KXAT100

2021-04-19 Thread eric robertson 
Please let me know if your are interested in selling.  Must be in excellent 
condition.  Thx.
Eric Robertson
ewrjunkm...@gmail.com
KI5PCZ

Sent from my iPad
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Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Buck 
I don't know what the correct signals are.  Haven't been able to find 
that data


k4ia, Buck
K3s# 11497
Honor Roll  8B DXCC
EasyWayHamBooks.com

On 4/19/2021 5:49 PM, Hal Massey wrote:

Hi Buck,

I appreciate the continuity tests you did on your cable. Can you functionally 
test the cable? With the cable connected to the 7610 are the correct signals at 
the cable outputs?

Regards
-Hal / WB6NNR


On Apr 19, 2021, at 1:06 PM, Buck  wrote:

Auto-sense works.  I just don't understand why Icom/Elecraft would even suggest 
hooking up the molex connector to the KAT500 if it doesn't do anything.  It is 
a waste of time.

I got the W2GNY plug to fool the 7610 into transmitting as 10 signal and it 
works.  I guess I will stick with that.

Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 4/19/2021 2:31 PM, Ken Winterling wrote:

Buck,
I have had the IC-7610 and KAT500/KPA500 for almost three years and they are a very nice 
pair (or trio..). The IC-7610 doesn't "control" the KAT500 per se. Changing 
bands/frequencies on the IC-7610 doesn't cause any response from the KAT500. Only when 
the IC-7610 transmits does the tuner detect (sense) the RF and then adjust the capacitors 
and inductors to match to the current antenna. An Elecraft transceiver, OTOH, does 
communicate with the KAT500 (and KPA500) and changes bands/frequencies/antenna ports as 
the bands and frequencies are changed.
The KPA500 responds the same way and changes bands by sensing transmit RF. You can build 
a "band data" cable to interface the IC-7620 to the KP500 and it will, with 
restrictions, follow the band selected by the IC-7610. The restriction is that Icom's 
band data voltages do not support the WARC bands. As a result, both 24 mHz and 28 mHz 
select 28mHz; both 18 mHz and 21 mHz select 21mHz. So, for all bands except WARC, the 
KPA500 will follow band selections made on the IC-7610 (or almost any other Icom such as 
the IC-7300, etc.).
I can send you a diagram of the band data cable if you would like. It is only marginally 
useful and most ops of non Elecraft gear seem to just let the KPA500 (and KAT500) RF 
sense the transmitted RF to make necessary selections. Be sure to read the KAT500 manual 
section regarding "training" your tuner.
GL!
Ken
WA2LBI
On Mon, Apr 19, 2021 at 2:05 PM Buck mailto:radiok...@gmail.com>> wrote:
I made up the cable from the Molex to the TUNE on the KAT500 as
described and have checked continuity from end to end.  All OK.
I have the SEND from the 7610 connected to the PTT RLY on the KAT500.
When I change bands, nothing happens.  Is there another setting I need
to change in the 7610?
Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com
On 4/19/2021 10:35 AM, Lyn Norstad wrote:
 > Buck -
 >
 > The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom
connections.
 >
 > The "AH4" cable (the one you're describing) powers the KAT500 and
controls
 > the "Tune" function.  If yours isn't doing anything, the cable is
probably
 > defective.
 >
 > What else do you have connected?
 >
 > 73
 > Lyn, W0LEN
 >
 >
 > -Original Message-
 > From: elecraft-boun...@mailman.qth.net

 > [mailto:elecraft-boun...@mailman.qth.net
] On Behalf Of Buck
 > Sent: Monday, April 19, 2021 7:42 AM
 > To: elecraft@mailman.qth.net 
 > Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610
 >
 > Anyone who has succeeded, I could use some help.  The connection from
 > the 7610 molex antenna tuner jack to the "Icom in" jack on the
KSAT500
 > doesn't do anything.
 >
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Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Hal Massey 
Hi Buck,

I appreciate the continuity tests you did on your cable. Can you functionally 
test the cable? With the cable connected to the 7610 are the correct signals at 
the cable outputs?

Regards
-Hal / WB6NNR

> On Apr 19, 2021, at 1:06 PM, Buck  wrote:
> 
> Auto-sense works.  I just don't understand why Icom/Elecraft would even 
> suggest hooking up the molex connector to the KAT500 if it doesn't do 
> anything.  It is a waste of time.
> 
> I got the W2GNY plug to fool the 7610 into transmitting as 10 signal and it 
> works.  I guess I will stick with that.
> 
> Buck, k4ia
> Honor Roll
> 8BDXCC
> EasyWayHamBooks.com
> 
> On 4/19/2021 2:31 PM, Ken Winterling wrote:
>> Buck,
>> I have had the IC-7610 and KAT500/KPA500 for almost three years and they are 
>> a very nice pair (or trio..). The IC-7610 doesn't "control" the KAT500 per 
>> se. Changing bands/frequencies on the IC-7610 doesn't cause any response 
>> from the KAT500. Only when the IC-7610 transmits does the tuner detect 
>> (sense) the RF and then adjust the capacitors and inductors to match to the 
>> current antenna. An Elecraft transceiver, OTOH, does communicate with the 
>> KAT500 (and KPA500) and changes bands/frequencies/antenna ports as the bands 
>> and frequencies are changed.
>> The KPA500 responds the same way and changes bands by sensing transmit RF. 
>> You can build a "band data" cable to interface the IC-7620 to the KP500 and 
>> it will, with restrictions, follow the band selected by the IC-7610. The 
>> restriction is that Icom's band data voltages do not support the WARC bands. 
>> As a result, both 24 mHz and 28 mHz select 28mHz; both 18 mHz and 21 mHz 
>> select 21mHz. So, for all bands except WARC, the KPA500 will follow band 
>> selections made on the IC-7610 (or almost any other Icom such as the 
>> IC-7300, etc.).
>> I can send you a diagram of the band data cable if you would like. It is 
>> only marginally useful and most ops of non Elecraft gear seem to just let 
>> the KPA500 (and KAT500) RF sense the transmitted RF to make necessary 
>> selections. Be sure to read the KAT500 manual section regarding "training" 
>> your tuner.
>> GL!
>> Ken
>> WA2LBI
>> On Mon, Apr 19, 2021 at 2:05 PM Buck > > wrote:
>>I made up the cable from the Molex to the TUNE on the KAT500 as
>>described and have checked continuity from end to end.  All OK.
>>I have the SEND from the 7610 connected to the PTT RLY on the KAT500.
>>When I change bands, nothing happens.  Is there another setting I need
>>to change in the 7610?
>>Buck, k4ia
>>Honor Roll
>>8BDXCC
>>EasyWayHamBooks.com
>>On 4/19/2021 10:35 AM, Lyn Norstad wrote:
>> > Buck -
>> >
>> > The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom
>>connections.
>> >
>> > The "AH4" cable (the one you're describing) powers the KAT500 and
>>controls
>> > the "Tune" function.  If yours isn't doing anything, the cable is
>>probably
>> > defective.
>> >
>> > What else do you have connected?
>> >
>> > 73
>> > Lyn, W0LEN
>> >
>> >
>> > -Original Message-
>> > From: elecraft-boun...@mailman.qth.net
>>
>> > [mailto:elecraft-boun...@mailman.qth.net
>>] On Behalf Of Buck
>> > Sent: Monday, April 19, 2021 7:42 AM
>> > To: elecraft@mailman.qth.net 
>> > Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610
>> >
>> > Anyone who has succeeded, I could use some help.  The connection from
>> > the 7610 molex antenna tuner jack to the "Icom in" jack on the
>>KSAT500
>> > doesn't do anything.
>> >
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>>
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>>
>>Message delivered to wa2...@gmail.com 
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Post:

Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread kd4iz 
Buck,

I have a similar setup with an IC-7300 and my KAT500/KPA500 combo. It does
not auto band change before key up. It does change on a quick, low power
tune however. IIRC I made a not so recent inquiry to Elecraft yielded the
explanation that my experience was correct. If I can find the message I will
post the text. 

As Ken WA2LBI  indicated in his message, what I did subsequently was to
jettison the "ICOM AH4 cable" set up (KAT500 Owners Manual, pg 8 to 10) and
just used a generic Analog radio configuration. The frequency sensing
capabilities of the ATU and amp do the job fast and efficiently. Currently I
use a 4-way RCA audio switch to select the keyline sig from one of the HF
radios I use and a remote antenna/rig selector (MFJ 4724) to route the
selected rig to the amp. The KAT500 remembers my preferred HF antenna for
the band I have chosen to use so the antenna side of the MFJ is used to
switch other coaxial feeds. 

Jack Spitznagel - KD4IZ

-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Buck
Sent: Monday, April 19, 2021 14:04
To: l...@lnainc.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

I made up the cable from the Molex to the TUNE on the KAT500 as described
and have checked continuity from end to end.  All OK.

I have the SEND from the 7610 connected to the PTT RLY on the KAT500.

When I change bands, nothing happens.  Is there another setting I need to
change in the 7610?

Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 4/19/2021 10:35 AM, Lyn Norstad wrote:
> Buck -
> 
> The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom connections.
> 
> The "AH4" cable (the one you're describing) powers the KAT500 and 
> controls the "Tune" function.  If yours isn't doing anything, the 
> cable is probably defective.
> 
> What else do you have connected?
> 
> 73
> Lyn, W0LEN
> 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Buck
> Sent: Monday, April 19, 2021 7:42 AM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610
> 
> Anyone who has succeeded, I could use some help.  The connection from 
> the 7610 molex antenna tuner jack to the "Icom in" jack on the KSAT500 
> doesn't do anything.
> 
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Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Ken Winterling 
The cable between the IC-7610 and the KAT500 does two things. First, it
supplies power to the KAT500 so it turns on when the IC-7610 is powered up.
Second, it allows the TUNER button on the IC-7610 to cause the '7610 to
switch to CW mode and transmit an approximate 10W signal. That, in turn,
causes the KAT500 to attempt to find a matching solution to the selected
antenna. You shouldn't need one of those "tuner plugs" as that function is
built into the KAT500 when connected by the AH-4 Molex cable wiring. The
above assumes that you have the KAT500 connected to the IC-7610 ANT1
antenna port.

If your KAT500 is not working that way with the IC-7610 TUNER button then I
would recheck the cable wiring and verify that the KAT500 is connected to
ANT1 on the IC-7610. If those are good it is possible there is a problem
with the KAT500.

Good luck!

Ken
WA2LBI






On Mon, Apr 19, 2021 at 3:06 PM Buck  wrote:

> Auto-sense works.  I just don't understand why Icom/Elecraft would even
> suggest hooking up the molex connector to the KAT500 if it doesn't do
> anything.  It is a waste of time.
>
> I got the W2GNY plug to fool the 7610 into transmitting as 10 signal and
> it works.  I guess I will stick with that.
>
> Buck, k4ia
> Honor Roll
> 8BDXCC
> EasyWayHamBooks.com
>
> On 4/19/2021 2:31 PM, Ken Winterling wrote:
> > Buck,
> >
> > I have had the IC-7610 and KAT500/KPA500 for almost three years and they
> > are a very nice pair (or trio..). The IC-7610 doesn't "control" the
> > KAT500 per se. Changing bands/frequencies on the IC-7610 doesn't cause
> > any response from the KAT500. Only when the IC-7610 transmits does the
> > tuner detect (sense) the RF and then adjust the capacitors and inductors
> > to match to the current antenna. An Elecraft transceiver, OTOH, does
> > communicate with the KAT500 (and KPA500) and changes
> > bands/frequencies/antenna ports as the bands and frequencies are changed.
> >
> > The KPA500 responds the same way and changes bands by sensing transmit
> > RF. You can build a "band data" cable to interface the IC-7620 to the
> > KP500 and it will, with restrictions, follow the band selected by the
> > IC-7610. The restriction is that Icom's band data voltages do not
> > support the WARC bands. As a result, both 24 mHz and 28 mHz select
> > 28mHz; both 18 mHz and 21 mHz select 21mHz. So, for all bands except
> > WARC, the KPA500 will follow band selections made on the IC-7610 (or
> > almost any other Icom such as the IC-7300, etc.).
> >
> > I can send you a diagram of the band data cable if you would like. It is
> > only marginally useful and most ops of non Elecraft gear seem to just
> > let the KPA500 (and KAT500) RF sense the transmitted RF to make
> > necessary selections. Be sure to read the KAT500 manual section
> > regarding "training" your tuner.
> >
> > GL!
> >
> > Ken
> > WA2LBI
> >
> >
> >
> >
> > On Mon, Apr 19, 2021 at 2:05 PM Buck  > > wrote:
> >
> > I made up the cable from the Molex to the TUNE on the KAT500 as
> > described and have checked continuity from end to end.  All OK.
> >
> > I have the SEND from the 7610 connected to the PTT RLY on the KAT500.
> >
> > When I change bands, nothing happens.  Is there another setting I
> need
> > to change in the 7610?
> >
> > Buck, k4ia
> > Honor Roll
> > 8BDXCC
> > EasyWayHamBooks.com
> >
> > On 4/19/2021 10:35 AM, Lyn Norstad wrote:
> >  > Buck -
> >  >
> >  > The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom
> > connections.
> >  >
> >  > The "AH4" cable (the one you're describing) powers the KAT500 and
> > controls
> >  > the "Tune" function.  If yours isn't doing anything, the cable is
> > probably
> >  > defective.
> >  >
> >  > What else do you have connected?
> >  >
> >  > 73
> >  > Lyn, W0LEN
> >  >
> >  >
> >  > -Original Message-
> >  > From: elecraft-boun...@mailman.qth.net
> > 
> >  > [mailto:elecraft-boun...@mailman.qth.net
> > ] On Behalf Of Buck
> >  > Sent: Monday, April 19, 2021 7:42 AM
> >  > To: elecraft@mailman.qth.net 
> >  > Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610
> >  >
> >  > Anyone who has succeeded, I could use some help.  The connection
> from
> >  > the 7610 molex antenna tuner jack to the "Icom in" jack on the
> > KSAT500
> >  > doesn't do anything.
> >  >
> > __
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > 
> > Help: http://mailman.qth.net/mmfaq.htm
> > 
> > Post: mailto:Elecraft@mailman.qth.net  Elecraft@mailman.qth.net>
> >
> > This list hosted

Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Buck 
Auto-sense works.  I just don't understand why Icom/Elecraft would even 
suggest hooking up the molex connector to the KAT500 if it doesn't do 
anything.  It is a waste of time.


I got the W2GNY plug to fool the 7610 into transmitting as 10 signal and 
it works.  I guess I will stick with that.


Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 4/19/2021 2:31 PM, Ken Winterling wrote:

Buck,

I have had the IC-7610 and KAT500/KPA500 for almost three years and they 
are a very nice pair (or trio..). The IC-7610 doesn't "control" the 
KAT500 per se. Changing bands/frequencies on the IC-7610 doesn't cause 
any response from the KAT500. Only when the IC-7610 transmits does the 
tuner detect (sense) the RF and then adjust the capacitors and inductors 
to match to the current antenna. An Elecraft transceiver, OTOH, does 
communicate with the KAT500 (and KPA500) and changes 
bands/frequencies/antenna ports as the bands and frequencies are changed.


The KPA500 responds the same way and changes bands by sensing transmit 
RF. You can build a "band data" cable to interface the IC-7620 to the 
KP500 and it will, with restrictions, follow the band selected by the 
IC-7610. The restriction is that Icom's band data voltages do not 
support the WARC bands. As a result, both 24 mHz and 28 mHz select 
28mHz; both 18 mHz and 21 mHz select 21mHz. So, for all bands except 
WARC, the KPA500 will follow band selections made on the IC-7610 (or 
almost any other Icom such as the IC-7300, etc.).


I can send you a diagram of the band data cable if you would like. It is 
only marginally useful and most ops of non Elecraft gear seem to just 
let the KPA500 (and KAT500) RF sense the transmitted RF to make 
necessary selections. Be sure to read the KAT500 manual section 
regarding "training" your tuner.


GL!

Ken
WA2LBI




On Mon, Apr 19, 2021 at 2:05 PM Buck > wrote:


I made up the cable from the Molex to the TUNE on the KAT500 as
described and have checked continuity from end to end.  All OK.

I have the SEND from the 7610 connected to the PTT RLY on the KAT500.

When I change bands, nothing happens.  Is there another setting I need
to change in the 7610?

Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 4/19/2021 10:35 AM, Lyn Norstad wrote:
 > Buck -
 >
 > The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom
connections.
 >
 > The "AH4" cable (the one you're describing) powers the KAT500 and
controls
 > the "Tune" function.  If yours isn't doing anything, the cable is
probably
 > defective.
 >
 > What else do you have connected?
 >
 > 73
 > Lyn, W0LEN
 >
 >
 > -Original Message-
 > From: elecraft-boun...@mailman.qth.net

 > [mailto:elecraft-boun...@mailman.qth.net
] On Behalf Of Buck
 > Sent: Monday, April 19, 2021 7:42 AM
 > To: elecraft@mailman.qth.net 
 > Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610
 >
 > Anyone who has succeeded, I could use some help.  The connection from
 > the 7610 molex antenna tuner jack to the "Icom in" jack on the
KSAT500
 > doesn't do anything.
 >
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Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Ken Winterling 
Buck,

I have had the IC-7610 and KAT500/KPA500 for almost three years and they
are a very nice pair (or trio..). The IC-7610 doesn't "control" the KAT500
per se. Changing bands/frequencies on the IC-7610 doesn't cause any
response from the KAT500. Only when the IC-7610 transmits does the tuner
detect (sense) the RF and then adjust the capacitors and inductors to match
to the current antenna. An Elecraft transceiver, OTOH, does
communicate with the KAT500 (and KPA500) and changes
bands/frequencies/antenna ports as the bands and frequencies are changed.

The KPA500 responds the same way and changes bands by sensing transmit RF.
You can build a "band data" cable to interface the IC-7620 to the KP500 and
it will, with restrictions, follow the band selected by the IC-7610. The
restriction is that Icom's band data voltages do not support the WARC
bands. As a result, both 24 mHz and 28 mHz select 28mHz; both 18 mHz and 21
mHz select 21mHz. So, for all bands except WARC, the KPA500 will follow
band selections made on the IC-7610 (or almost any other Icom such as the
IC-7300, etc.).

I can send you a diagram of the band data cable if you would like. It is
only marginally useful and most ops of non Elecraft gear seem to just let
the KPA500 (and KAT500) RF sense the transmitted RF to make necessary
selections. Be sure to read the KAT500 manual section regarding "training"
your tuner.

GL!

Ken
WA2LBI





On Mon, Apr 19, 2021 at 2:05 PM Buck  wrote:

> I made up the cable from the Molex to the TUNE on the KAT500 as
> described and have checked continuity from end to end.  All OK.
>
> I have the SEND from the 7610 connected to the PTT RLY on the KAT500.
>
> When I change bands, nothing happens.  Is there another setting I need
> to change in the 7610?
>
> Buck, k4ia
> Honor Roll
> 8BDXCC
> EasyWayHamBooks.com
>
> On 4/19/2021 10:35 AM, Lyn Norstad wrote:
> > Buck -
> >
> > The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom connections.
> >
> > The "AH4" cable (the one you're describing) powers the KAT500 and
> controls
> > the "Tune" function.  If yours isn't doing anything, the cable is
> probably
> > defective.
> >
> > What else do you have connected?
> >
> > 73
> > Lyn, W0LEN
> >
> >
> > -Original Message-
> > From: elecraft-boun...@mailman.qth.net
> > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Buck
> > Sent: Monday, April 19, 2021 7:42 AM
> > To: elecraft@mailman.qth.net
> > Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610
> >
> > Anyone who has succeeded, I could use some help.  The connection from
> > the 7610 molex antenna tuner jack to the "Icom in" jack on the KSAT500
> > doesn't do anything.
> >
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Buck 
I made up the cable from the Molex to the TUNE on the KAT500 as 
described and have checked continuity from end to end.  All OK.


I have the SEND from the 7610 connected to the PTT RLY on the KAT500.

When I change bands, nothing happens.  Is there another setting I need 
to change in the 7610?


Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 4/19/2021 10:35 AM, Lyn Norstad wrote:

Buck -

The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom connections.

The "AH4" cable (the one you're describing) powers the KAT500 and controls
the "Tune" function.  If yours isn't doing anything, the cable is probably
defective.

What else do you have connected?

73
Lyn, W0LEN


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Buck
Sent: Monday, April 19, 2021 7:42 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

Anyone who has succeeded, I could use some help.  The connection from
the 7610 molex antenna tuner jack to the "Icom in" jack on the KSAT500
doesn't do anything.


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Re: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Lyn Norstad 
Buck -

The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom connections.

The "AH4" cable (the one you're describing) powers the KAT500 and controls
the "Tune" function.  If yours isn't doing anything, the cable is probably
defective.

What else do you have connected?

73
Lyn, W0LEN


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Buck
Sent: Monday, April 19, 2021 7:42 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610

Anyone who has succeeded, I could use some help.  The connection from 
the 7610 molex antenna tuner jack to the "Icom in" jack on the KSAT500 
doesn't do anything.
-- 
k4ia, Buck
K3s# 11497
Honor Roll  8B DXCC
EasyWayHamBooks.com
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Re: [Elecraft] KBPF3A switching frequencies and performance

2021-04-19 Thread Russ Tobolic via Elecraft 
 Hi Ben:
You had me curious with your request.  I started to check my KBPF3 (modified to 
the "A") and noticed something that now bothers me.  I tried going down from 
160M and it appears that the switch over to the AM broadcast band occurs 
precisely at 1700,000  Kc.  When I tune to  1.69 the relays click.  But the 
anomaly(?) I am seeing at the switchover point is a big drop in the signal 
level.  At my QTH during the daytime the nominal noise level at 1700.000 Kc is 
about S7.  When I switch to 1.69 the noise level drops to S2.  At the high 
end the switchover occurs at 2109.999+ with a drop in the noise level from 
S9+10 to S3.  I don't use the K3 for listening to AMBCB but only in the case of 
checking my 160M  receiving loops with some stations high in the AM Band.  I 
checked on 80M and got similar results.  At the low side the switch occurred at 
3299.999 with a drop in the noise level from S5 to S2.  On the high side the 
switchover occurred at 4209.999+ but here the noise level increased from S4 to 
S6. I don't know if this helps you any on at least these 2 bands.  If I get the 
time I'll try to check the rest.  Now I'm bothered by the changes in signal 
levels at the switchover points (ignorance is bliss).   I wonder if anyone else 
has ever noticed this or do I have an issue with my KBPF3?

Russ, N3CO
On Friday, April 16, 2021, 12:39:28 PM EDT, w4sc  
wrote:  
 
 Looking for details of switch over frequencies and expected performance of the 
KBPF3A in its various bands, 

There is improvement in the BCB and below 500KHz with the KBPF3A enabled, 
however the other SW BCB bands I have tried are lacking.

Has anyone measured the performance of the KBPF3A?

Ben W4SC

Sent from Mail for Windows 10

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[Elecraft] Controlling KAT500/KPA500 with Icom 7610

2021-04-19 Thread Buck 
Anyone who has succeeded, I could use some help.  The connection from 
the 7610 molex antenna tuner jack to the "Icom in" jack on the KSAT500 
doesn't do anything.

--
k4ia, Buck
K3s# 11497
Honor Roll  8B DXCC
EasyWayHamBooks.com
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